Colour-magnitude data in the (m_F150W2 — m_F322W2, m_F322W2) plane (left, grey dots) are compared with the theoretical models. Contrary to the previous diagram, the agreement is unsatisfactory. These are the data from which the luminosity function was derived. The LF is shown in the right side of the figure (grey dots), together with the theoretical luminosity function obtained by assuming a flat MF below 0.3 M_⊙, by normalising the mass luminosity derivative of the models to the data. The figure shows that the observational LF would be reproduced if the transition masses were more luminous than computed by about 1.5 mag.